Thick, heavy pages free the young reader to turn the pages with enthusiasm and no worries.  Although, the binding on this particular copy wasn’t strong enough to withstand library use, it may be that it was stitched this way because it’s a demo and will have stronger binding in publication.  The visual layout of the book is exceptional.  It feels “layered”.  There are pictures that are larger, some have frames, and there are captions along with regular text.  Just the right amount of visuals, not overdone, as is the case with more and more nonfiction books.  Glossary and Index at the end.  No websites listed in this book, but there was a free e-book download.  Got the book to download, but it was complicated to operate.  I recommend this book for a primary reader.